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Jeep XJ. Manual - part 141

PDC RELAY WEDGE

(1) From the top of the PDC housing, align and

insert the PDC relay wedge latch arms into the cor-
rect cavities in the relay cassette.

(2) Gently and evenly press the PDC relay wedge

down into the relay cassette until both of the latches
are fully engaged.

(3) Install each of the removed relays into the

proper cavities of the PDC relay wedge.

(4) Install the PDC housing lower cover.

PDC HOUSING LOWER COVER

(1) Align the PDC housing lower cover to the bot-

tom of the PDC.

(2) Press the PDC housing lower cover gently and

evenly onto the PDC until each of the latches that
secure the cover to the PDC is fully engaged.

(3) Engage the mounting slots on the PDC housing

with the stanchions of the PDC mounting bracket
and push the unit downward until the mounting
bracket latches fully engage the mounting tabs on
the PDC housing.

(4) Install the battery wire harness PDC take out

eyelets over the PDC B(+) terminal stud.

(5) Install and tighten the nut that secures the

eyelets of the battery wire harness PDC take outs to
the B(+) terminal stud. Tighten the nut to 10.8 N·m
(95 in. lbs.).

(6) Install the B(+) terminal stud cover onto the

PDC.

(7) Install the cover onto the PDC.
(8) Reconnect the battery negative cable.

SPECIAL TOOLS

POWER DISTRIBUTION SYSTEMS

Fig. 15 PDC Relay Cassette Terminal Remove/Install

1 – TERMINAL CAVITIES (TYPICAL)
2 – PDC RELAY CASSETTE (TYPICAL)
3 – TERMINAL LATCHES (TYPICAL)
4 – FROM SPECIAL TOOL KIT 6680

Terminal Pick Kit 6680

8O - 10

POWER DISTRIBUTION SYSTEMS

DISASSEMBLY AND ASSEMBLY (Continued)

POWER LOCK SYSTEMS

TABLE OF CONTENTS

page

GENERAL INFORMATION

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . 1
POWER LOCK SYSTEM . . . . . . . . . . . . . . . . . . . . 1
REMOTE KEYLESS ENTRY SYSTEM . . . . . . . . . . 1

DESCRIPTION AND OPERATION

POWER LOCK SWITCH . . . . . . . . . . . . . . . . . . . . 2
DOOR MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . 2
POWER LOCK MOTOR . . . . . . . . . . . . . . . . . . . . . 2
REMOTE KEYLESS ENTRY TRANSMITTER . . . . . 2
REMOTE KEYLESS ENTRY RECEIVER . . . . . . . . . 2

DIAGNOSIS AND TESTING

POWER LOCK SYSTEM AND REMOTE

KEYLESS ENTRY SYSTEM . . . . . . . . . . . . . . . . 3

DOOR MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . 3

POWER LOCK MOTOR . . . . . . . . . . . . . . . . . . . . . 4
REMOTE KEYLESS ENTRY TRANSMITTER . . . . . 5
REMOTE KEYLESS ENTRY RECEIVER . . . . . . . . . 5

SERVICE PROCEDURES

REMOTE KEYLESS ENTRY TRANSMITTER

BATTERY REPLACEMENT . . . . . . . . . . . . . . . . . 6

REMOTE KEYLESS ENTRY TRANSMITTER

PROGRAMMING . . . . . . . . . . . . . . . . . . . . . . . . 6

REMOTE KEYLESS ENTRY RECEIVER

PROGRAMMING . . . . . . . . . . . . . . . . . . . . . . . . 6

REMOVAL AND INSTALLATION

DOOR MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . 7
POWER LOCK MOTOR . . . . . . . . . . . . . . . . . . . . . 7
REMOTE KEYLESS ENTRY RECEIVER . . . . . . . . . 8

GENERAL INFORMATION

INTRODUCTION

Power locks are optional factory-installed equip-

ment on this model. The power window system and
the power mirror system are included on vehicles
equipped with the power lock option. The Remote
Keyless Entry (RKE) system is an additional option
available on vehicles equipped with the power lock
option. Refer to 8W-61 - Power Door Locks in Group
8W - Wiring Diagrams for complete circuit descrip-
tions and diagrams.

NOTE: This group covers both Left-Hand Drive
(LHD) and Right-Hand Drive (RHD) versions of this
model. Whenever required and feasible, the RHD
versions of affected vehicle components have been
constructed as mirror-image of the LHD versions.
While most of the illustrations used in this group
represent only the LHD version, the diagnostic and
service

procedures

outlined

can

generally

applied to either version. Exceptions to this rule
have been clearly identified as LHD or RHD, if a
special illustration or procedure is required.

POWER LOCK SYSTEM

The power lock system allows all of the doors and

the liftgate to be locked or unlocked electrically by
operating the switch on either front door trim panel.
This system operates with battery power supplied

through a fuse in the junction block, independent of
the ignition switch.

The power lock system includes a lock inhibit fea-

ture, which prevents the doors from being locked by
the power lock system if the driver door is open with
the key in the ignition switch or with the headlamp
switch in the On position. However, the lock inhibit
feature will not prevent manual locking of the vehicle
using the manual lock buttons or the key cylinders.

The power lock system includes the front door

power lock switches integral to the driver and pas-
senger door modules, and the power lock motors
mounted in each door and the liftgate. The power
lock control circuitry and the power lock and unlock
relays are integral to the Passenger Door Module
(PDM).

Following are general descriptions of the major

components in the power lock system. Refer to the
owner’s manual in the vehicle glove box for more
information on the features, use and operation of the
power lock system.

REMOTE KEYLESS ENTRY SYSTEM

The Remote Keyless Entry (RKE) system is a radio

frequency system that allows the use of a remote bat-
tery-powered radio transmitter to control the power
lock system. On vehicles with the RKE option, the
power locks can be operated by depressing the Lock
or Unlock buttons of the RKE transmitter. The RKE
system includes an illuminated entry feature, which
turns on the courtesy lamps for a timed interval

POWER LOCK SYSTEMS

8P - 1

(about thirty seconds), when the power locks are
unlocked using the RKE transmitter.

The RKE system for this vehicle also features a

customer programmable horn chirp feature. This fea-
ture allows the customer the option of enabling or
disabling the horn chirp request that the RKE
receiver issues as an audible indication that a valid
Lock signal has been received from the RKE trans-
mitter. See Remote Keyless Entry Receiver Program-
ming in this group for more information on this
feature.

The RKE system can retain the vehicle access

codes of up to four transmitters. The transmitter
codes are retained in memory, even if the battery is
disconnected. If a transmitter is faulty or lost, new
transmitter vehicle access codes can be programmed
into the system using a DRB scan tool and the
proper Diagnostic Procedures manual.

The RKE system consists of the remote key fob

transmitter and a radio receiver with program logic.
The RKE receiver is installed in an RKE housing on
the headliner of the vehicle, or in the housing of the
optional overhead console, depending upon how the
vehicle is equipped.

Following are general descriptions of the major

components in the RKE system. Refer to the owner’s
manual in the vehicle glove box for more information
on the features, use and operation of the RKE sys-
tem.

DESCRIPTION AND OPERATION

POWER LOCK SWITCH

The power locks are controlled by a two-way switch

that is integral to the Driver Door Module (DDM)
and the Passenger Door Module (PDM) mounted in
the trim panel of its respective front door. Each
switch is illuminated by a light-emitting diode when
the ignition switch is turned to the On position. The
power lock switches provide a hard-wired lock or
unlock signal to the power lock system control cir-
cuitry, which is located in the PDM.

The power lock switches and their lamps cannot be

repaired. If the switches are damaged or faulty, the
entire PDM or DDM unit must be replaced.

DOOR MODULE

A Driver Door Module (DDM) and a Passenger

Door Module (PDM) are used on all models equipped
with power locks and power windows. Each door
module houses both the front door power lock and
power window switches. In addition to the switches
for its own door, the DDM houses individual switches
for each passenger door power window, a power win-
dow lockout switch and the power mirror switch. The

PDM contains the control circuitry and the power
lock and unlock relays for the entire power lock sys-
tem.

In its role as the power lock control module, the

PDM receives inputs from the battery, the ignition
switch, the DDM, the driver door ajar switch, the
key-in ignition switch, and the headlamp switch. It
also receives a hard-wired input from the remote
Keyless Entry (RKE) receiver, if the vehicle is so
equipped. In response to these inputs, the PDM
sends the proper outputs to control the power lock
motors through its integral power lock and unlock
relays.

The DDM and the PDM are mounted to their

respective front door trim panels. The DDM and
PDM

are

serviced

individually

and

cannot

repaired. If the DDM or PDM, or any of the switches
and circuitry that they contain are faulty or dam-
aged, the complete DDM or PDM unit must be
replaced.

POWER LOCK MOTOR

In the power lock and Remote Keyless Entry

(RKE) systems, the locks are actuated by a reversible
electric motor mounted within each door and the lift-
gate. The power lock motor direction is controlled by
the battery and ground feeds from the power lock
and unlock relays integral to the Passenger Door
Module (PDM).

The power lock motors cannot be repaired and, if

faulty

damaged,

the

entire

motor

must

replaced.

REMOTE KEYLESS ENTRY TRANSMITTER

The Remote Keyless Entry (RKE) system transmit-

ter is equipped with two buttons, labeled Lock and
Unlock. It is also equipped with a key ring and is
designed to serve as a key fob. The operating range
of the transmitter radio signal is up to 7 meters (23
feet) from the RKE receiver.

Each transmitter has a different vehicle access

code, which must be programmed into the memory of
the RKE receiver in the vehicle in order to operate
the RKE system. See Remote Keyless Entry Trans-
mitter Programming in this group for more informa-
tion.

The

transmitter

operates

two

Panasonic

CR2016 (or equivalent) batteries. Typical battery life
is from one to two years. The transmitter cannot be
repaired and, if faulty or damaged, it must be
replaced.

REMOTE KEYLESS ENTRY RECEIVER

On models with the Remote Keyless Entry (RKE)

option, an RKE receiver is mounted in an RKE hous-
ing, or in the overhead console housing on the vehicle

8P - 2

POWER LOCK SYSTEMS

GENERAL INFORMATION (Continued)

headliner. The RKE receiver is a radio frequency unit
that also contains the RKE system program logic.
The RKE receiver also performs as a smart relay for
the illuminated entry feature.

The RKE receiver has a memory function to retain

the vehicle access codes of at least one, but no more
than four RKE transmitters. The receiver is designed
to retain the transmitter codes in memory, even if
the battery is disconnected.

The RKE receiver receives inputs from the battery,

the driver door ajar switch, and the Chrysler Colli-
sion Detection (CCD) data bus. It also receives the
radio signal input from the RKE transmitter. In
response to those inputs, it is programmed to control
outputs to the power lock motors, the courtesy lamp
circuits, and the vehicle horn.

The RKE system for this vehicle also features a

The RKE receiver cannot be repaired and, if faulty

or damaged, it must be replaced.

DIAGNOSIS AND TESTING

POWER LOCK SYSTEM AND REMOTE
KEYLESS ENTRY SYSTEM

On models without the Remote Keyless Entry

(RKE) option, proceed directly to the Door Module
diagnosis. As a preliminary diagnosis for models with
the RKE system, note the power lock system and
illuminated entry system operation while you actuate
both the Lock and Unlock functions with the power
lock switches and the RKE transmitter. Then, pro-
ceed as follows:

• If the entire power lock system fails to function

with either the power lock switches or the RKE
transmitter, unplug the wire harness connector from
the RKE receiver and test the power lock system
operation again using the power lock switches. If the
power lock system now operates, see the Remote
Keyless Entry Receiver diagnosis in this group. If the
power lock system still fails to operate, see the Door
Module diagnosis in this group.

• If the power lock system functions with both

power lock switches, but not with the RKE transmit-
ter, see the Remote Keyless Entry Transmitter diag-
nosis in this group.

• If one power lock motor fails to operate with

both of the power lock switches and/or the RKE

transmitter, see the Power Lock Motor diagnosis in
this group.

• If the RKE and power lock systems are function-

ing, but the illuminated entry system fails to operate,
see the Remote Keyless Entry Receiver diagnosis in
this group.

DOOR MODULE

If the power lock system is inoperative with either

front door power lock switch, test the Passenger Door
Module (PDM). If the power lock system is inopera-
tive with only the driver side front door power lock
switch, test the Driver Door Module (DDM). For cir-
cuit descriptions and diagrams, refer to 8W-61 -
Power Door Locks in Group 8W - Wiring Diagrams.

DRIVER DOOR MODULE

The only function of the Driver Door Module

(DDM) in the power lock system is to provide a Lock
or Unlock signal to the power lock system control cir-
cuitry contained within the Passenger Door Module
(PDM). The DDM signals the PDM by providing a
hard-wired ground path through the DDM ground
circuit and the driver side power lock switch contacts
to the lock request or unlock request terminals of the
PDM. The DDM power lock switch function can be
tested as follows:

(1) Disconnect and isolate the battery negative

cable. Remove the driver side front door trim panel
and unplug the 12-way DDM wire harness connector
(C-2) from the DDM. Check for continuity between
the ground circuit cavity of the 12-way DDM wire
harness connector and a good ground. There should
be continuity. If OK, go to Step 2. If not OK, repair
the open circuit to ground as required.

(2) If the problem being diagnosed is inoperative

power lock switch illumination, proceed as follows. If
the problem is not power lock switch illumination, go
to Step 4. Connect the battery negative cable. Turn
the ignition switch to the Accessory or On positions.
Check for battery voltage at both sides of the power
window circuit breaker in the junction block. If OK,
go to Step 3. If not OK, replace the faulty circuit
breaker.

(3) With the ignition switch still in the On or

Accessory position, check for battery voltage at the
fused ignition switch output circuit cavity of the
12-way DDM wire harness connector. If OK, replace
the faulty DDM. If not OK, repair the open circuit to
the junction block as required.

(4) Test the power lock switch continuity through

the DDM 12-way wire harness connector receptacle.
See the DDM Power Lock Switch Continuity chart
(Fig. 1) to determine if the continuity is correct in
both the Lock and Unlock switch positions. If OK,
repair the lock request circuit and/or the unlock

POWER LOCK SYSTEMS

8P - 3

DESCRIPTION AND OPERATION (Continued)

Content .. 139 140 141 142 ..